SpringBoot ApplicationListener 监听执行顺序

自己创建Listenert 实现 ApplicationListener

package com.mgk.demov1.listeners;

import com.mgk.demov1.annotation.Student;
import com.sun.org.apache.bcel.internal.generic.SWITCH;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.context.event.*;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.event.ContextClosedEvent;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.context.event.ContextStartedEvent;
import org.springframework.context.event.ContextStoppedEvent;

public class MyListenery implements ApplicationListener {
    @Override
    public void onApplicationEvent(ApplicationEvent event) {
//        ApplicationStartingEvent//启动开始的时候执行的事件
//        ApplicationEnvironmentPreparedEvent//上下文创建之前运行的事件
//        ApplicationContextInitializedEvent//
//        ApplicationPreparedEvent//上下文创建完成，注入的bean还没加载完成
//        ContextRefreshedEvent//上下文刷新
//        ServletWebServerInitializedEvent//web服务器初始化
//        ApplicationStartedEvent//
//        ApplicationReadyEvent//启动成功
//        ApplicationFailedEvent//在启动Spring发生异常时触发
        switch (event.getClass().getSimpleName()){
            case "ApplicationStartingEvent":
                System.out.println("启动开始的时候执行的事件");
                break;
            case "ApplicationEnvironmentPreparedEvent":
                System.out.println("上下文创建之前运行的事件");
                break;
            case "ApplicationContextInitializedEvent":
                System.out.println("上下文初始化");
                break;
            case "ApplicationPreparedEvent":
                System.out.println("上下文创建完成，注入的bean还没加载完成");
                break;
            case "ContextRefreshedEvent":
                System.out.println("上下文刷新");
                if( event instanceof ContextRefreshedEvent){
                    Object stu = ((ContextRefreshedEvent) event).getApplicationContext().getBean("stu");
                    System.out.println(stu);
                }
                break;
            case "ApplicationStartedEvent":
                System.out.println("ApplicationStartedEvent");
                break;
            case "ApplicationReadyEvent":
                System.out.println("启动成功");
                break;
            case "ApplicationFailedEvent":
                break;
        }
    }
}

package com.mgk.demov1.annotation;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class Configurtion {
    @Bean(name = "stu")
    public Student getStudent(){
        return new Student();
    }
}

也可以单独去实现其中一个监听事件，来解决业务具体操作

package com.mgk.demov1.listeners;

import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;

public class MyListenerv2 implements ApplicationListener {

    @Override
    public void onApplicationEvent(ContextRefreshedEvent contextRefreshedEvent) {
        System.out.println(contextRefreshedEvent);
    }
}

 

主程序这边可以添加多个自定义监听顺序自上而下

        SpringApplication app = new SpringApplication(Demov1Application.class);
        app.addListeners(new MyListenery());
        app.addListeners(new MyListenerv2());
        app.run(args);